Air Pump Loud At Startup - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 04-21-2005, 12:01 PM
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My E-39 makes a loud drone at startup, and continues for a minute or so, depending on outside temp. Sounds like some sort of air pump, what is it, and can it be stopped, or is it normal?
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#2 (permalink) Old 04-21-2005, 01:32 PM
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sp0rky is an unknown quantity at this point
if it is in-fact the air pump, yes it's normal - it's getting the engine ready ... it's basically an emissions thing.

if it's not the air pump, you might have a problem. check it out. Air pump should be toward the front of the engine compartment, have a listen.

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